Afghanistan (ăfgăn'istăn", ăfgän"istän') [key], officially Islamic Republic of Afghanistan, republic (2005 est. pop. 29,929,000), 249,999 sq mi (647,497 sq km), S central Asia. Afghanistan is bordered by Iran on the west, by Pakistan on the east and south, and by Turkmenistan, Uzbekistan, and Tajikistan on the north; a narrow strip, the Vakhan (Wakhan), extends in the northeast along Pakistan to the Xinjiang Uygur Autonomous Region of China. The capital and largest city is Kabul.
